Humans have used copper since the beginning of time. This soft metal has a reddish orange metallic luster when first cut, and its elemental substance is purplish red. Cables and electrical and electronic components are commonly made of this material due to its good ductility and high thermal and electrical conductivity. It can also be used as building materials and can be made of many alloys. The most important copper alloys are bronze and brass, which have excellent mechanical properties and low resistivity. More detail please visit： https://www.tenral.com/copper-stamping/ read full review »